As of January, 2017 the Dual Tone Booster comes with significant changes. It now include impossible-to-find Sprague Q-Line resistors in the OD channel and Allen Bradley carbon composition resistors in the clean channel. It also includes a clean boost on the Clean channel and a choice of two full range boosts or one full range and one mid boost on the OD channel.

Park:Colby 2015 Brochure

Park:Colby 2016 NAMM New Products Brochure

Park Amplifiers and Mitch Colby have no current association with Marshall Amplification, plc.